Crankshaft/Balancer - Yamaha YFM250XL(C) Service Manual

ENGINE ASSEMBLY AND ADJUSTMENT

CRANKSHAFT/BALANCER

1 Balancer driven gear
2 Bearing
3 Straight key
4 Balancer
5 Oil seal
6 Balancer drive gear
PISTON TO CYLINDER CLEARANCE:
A
0.04 ~ 0.06 mm (0.0016 ~ 0.0024 in)
END GAP (INSTALLED):
Top ring <limit>
0.4 mm (0.016 in)
B 2nd ring <limit>
0.4 mm (0.016 in)
Oil ring
0.2 ~ 0.7 mm (0.008 ~ 0.028 in)
D BALANCER GEAR INSTALLATION:
7 Woodruff key
8 Crank (right)
9 Connecting rod
0 Small end bearing
A Crank pin
B Crank (left)
C CRANKSHAFT:
A = 55.95 ~ 56.00 mm
(2.203 ~ 2.205 in)
C = 0.03 mm (0.0012 in)
1
C = 0.06 mm (0.0024 in)
2
D = 0.35 ~ 0.65 mm
(0.014 ~ 0.026 in)
E = 0.010 ~ 0.025 mm
(0.0004 ~ 0.0010 in)
F = 0.8 ~ 1.0 mm
(0.032 ~ 0.040 in)
4 - 47
ENG
4